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Derivative Financial Instruments, Agency Business (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) item
Derivative Financial Instruments
Notional Value, classified in Other Assets	$ 290,081		$ 290,081		$ 173,532
Notional Value, classified in Other Liabilities	112,458		112,458		347,701
Net (losses) gains from changes in the fair value of derivatives	4,100	$ 1,100	(4,200)	$ (1,400)
(Loss) gain on derivative instruments	(7,368)	742	(58,099)	(1,723)
Income from mortgage servicing rights	32,417	18,709	54,351	32,941
Other Income
Derivative Financial Instruments
(Loss) gain on derivative instruments	32,400	18,700	$ 54,400	32,900
Swap Futures
Derivative Financial Instruments
Derivative, maturity term			3 months
Swap Futures | Minimum
Derivative Financial Instruments
Derivative Swap Rate Period			5 years
Swap Futures | Maximum
Derivative Financial Instruments
Derivative Swap Rate Period			10 years
Swap Futures | Agency Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	(11,200)		$ (57,300)
Unrealized gain (loss) on derivatives	(8,200)		(1,600)
Swap Futures | Structured Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	(200)	(300)	(2,800)	(300)
Unrealized gain (loss) on derivatives	(100)	$ (100)	(500)	$ (100)
Non-Qualifying | Agency Business
Derivative Financial Instruments
Notional Value, classified in Other Assets	406,538		406,538		848,633
Fair Value, classified in Other Assets	2,214		2,214		1,435
Fair Value, classified in Other Liabilities	$ (219)		$ (219)		$ (3,097)
Non-Qualifying | Rate lock commitments | Agency Business
Derivative Financial Instruments
Count | item	5		5		5
Notional Value, classified in Other Assets	$ 29,070		$ 29,070		$ 37,657
Fair Value, classified in Other Assets	549		549		1,066
Fair Value, classified in Other Liabilities	$ (128)		$ (128)		$ (202)
Non-Qualifying | Forward Sale Commitments | Agency Business
Derivative Financial Instruments
Count | item	54		54		79
Notional Value, classified in Other Assets	$ 373,468		$ 373,468		$ 483,576
Fair Value, classified in Other Assets	1,665		1,665		369
Fair Value, classified in Other Liabilities	$ (91)		$ (91)		$ (2,895)
Non-Qualifying | Swap Futures | Agency Business
Derivative Financial Instruments
Count | item	40		40		3,274
Notional Value, classified in Other Assets	$ 4,000		$ 4,000		$ 327,400
Non-Qualifying | Swap Futures | Structured Business
Derivative Financial Instruments
Count | item	345		345		271
Notional Value, classified in Other Assets	$ 34,500		$ 34,500		$ 27,100

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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